[gnome-autoar] Prevent calling g_output_stream_write with NULL stream

[Ting-Wei Lan <lantw src gnome org>]

commit e131748ff7a62f6e82b7402452450019642538ec
Author: Ting-Wei Lan <lantw44 gmail com>
Date:   Thu Sep 12 01:13:01 2013 +0800

    Prevent calling g_output_stream_write with NULL stream

 gnome-autoar/autoar-create.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gnome-autoar/autoar-create.c b/gnome-autoar/autoar-create.c
index 4b35b09..f5a16a8 100644
--- a/gnome-autoar/autoar-create.c
+++ b/gnome-autoar/autoar-create.c
@@ -473,7 +473,7 @@ libarchive_write_write_cb (struct archive *ar_write,
   g_debug ("libarchive_write_write_cb: called");
 
   arcreate = (AutoarCreate*)client_data;
-  if (arcreate->priv->error != NULL) {
+  if (arcreate->priv->error != NULL || arcreate->priv->ostream == NULL) {
     return -1;
   }